Target Audience:
Owners, mechanics, and enthusiasts of the Yamaha YFZ350 Banshee.
Importance To Owner:
Essential for maintaining performance, diagnosing issues, and performing repairs on a high-performance sport ATV.
Manual Value Proposition:
Provides comprehensive, authoritative information directly from Yamaha, ensuring accuracy and completeness for effective maintenance and repair.
Diagnostic Tools Explained:
Guidance on using common tools and techniques for diagnosis.
Diagrams Illustrations:
Includes detailed diagrams, exploded views, and illustrations for clarity in disassembly and assembly.
Years Covered:
1987, 1988, 1989, 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003
Regional Coverage:
Primarily North American market, but applicable to global variations with minor differences.
Estimated Page Count:
300-500 (typical for comprehensive workshop manuals)
Manual Classification:
Workshop Service Manual / Repair Manual
Digital Format:
PDF Download
Engine Mechanical:
Complete overhaul, disassembly, assembly, troubleshooting, component inspection (cylinders, pistons, crankshaft, connecting rods, bearings).
Engine Tuning:
Carburetor adjustment and synchronization, ignition timing, exhaust system considerations, porting and modification guidance (theoretical).
Fuel System:
Fuel tank, fuel lines, oil injection system, carburetors (Mikuni VM Series), fuel filters.
Ignition System:
CDI ignition system, stator, ignition coil, spark plugs, troubleshooting.
Cooling System:
Liquid cooling system components, radiator, water pump, hoses, coolant specifications.
Transmission Drivetrain:
Clutch operation, gearbox disassembly and assembly, gear ratios, chain drive maintenance, lubrication.
Suspension Steering:
Front and rear suspension components (shocks, springs, control arms), steering linkage, bearing service.
Braking System:
Hydraulic disc brakes (front and rear), brake pad replacement, caliper service, fluid bleeding, master cylinder maintenance.
Electrical System:
Wiring diagrams, lighting system, battery maintenance, starter motor, fuses, troubleshooting electrical faults.
Frame Chassis:
Frame inspection, component mounting, body panel removal and installation.
Scheduled Maintenance:
Oil changes, filter replacements, spark plug checks, chain adjustment, brake system checks, coolant flushes.
Troubleshooting:
Systematic diagnosis of common problems, error code interpretation (if applicable), symptom-based repair guidance.
Engine Rebuild:
Detailed steps for complete engine disassembly, part measurement, component replacement, and reassembly.
Carburetor Rebuild:
Step-by-step instructions for cleaning, rebuilding, and adjusting the Mikuni VM carburetors.
Suspension Adjustment:
Guidance on setting sag, rebound, and compression damping for optimal performance.
Electrical Diagnostics:
Using wiring diagrams to trace faults, test components, and repair electrical issues.
Brake Bleeding:
Proper procedure for bleeding the hydraulic brake system to ensure optimal performance.
Diagnostic Capabilities:
Advanced diagnostic procedures, including visual inspection, component testing with specifications, and troubleshooting flowcharts.
Repair Complexity:
Covers everything from basic user maintenance to complete engine and transmission overhauls.
Modification Support:
While primarily a repair manual, it provides foundational knowledge for understanding performance modifications. (Note: Specific performance tuning guides may be separate).
Engine Type:
Liquid-Cooled, 2-Stroke, Reed Valve
Engine Displacement:
347 cc (for most common configurations)
Bore X Stroke:
64.0 mm x 54.0 mm (typical)
Compression Ratio:
Approx. 7.4:1 (stock)
Cylinder Configuration:
Two Cylinders, Inline
Horsepower Estimate:
50+ HP (stock, depending on year and region)
Torque Estimate:
Approx. 35-40 lb-ft (stock)
Carburetor Type:
Dual Mikuni VM34SS
Fuel Type:
Unleaded gasoline (91 octane or higher recommended)
Oil Injection:
Separate oil injection system (Yamalube 2-stroke oil or equivalent).
Transmission Type:
6-Speed Manual with Constant Mesh
Clutch Type:
Wet, Multi-Plate
Reverse Gear:
Yes (on most models, consult specific year)
Gear Ratios:
Specific ratios detailed in the manual for each gear.
Transmission Fluid Type:
Yamaha Super Sports 10W-30 (or equivalent API SE, SF, SG rated 10W-30)
Transmission Fluid Capacity:
Approx. 0.85 L (check manual for exact figure)
Engine Oil Change Interval:
Every 20 hours of operation or annually, whichever comes first.
Transmission Oil Change Interval:
Every 20 hours of operation or annually, whichever comes first.
Air Filter Cleaning:
Every 10 hours of operation, or more frequently in dusty conditions.
Spark Plug Replacement:
Refer to manual for specific mileage/hour recommendations, typically inspected at major service intervals.
Chain Lubrication Adjustment:
Every 10 hours of operation, or more frequently if exposed to water or mud.
Engine Oil Specification:
Yamaha Super Sports 10W-30 (API SE, SF, SG or higher).
Coolant Specification:
Permanent type antifreeze coolant (ethylene glycol-based), diluted with distilled water in a 50:50 ratio.
Brake Fluid Specification:
DOT 3 or DOT 4 hydraulic brake fluid.
2-Stroke Oil Specification:
Yamalube 2-stroke oil or equivalent premium quality, ashless, NMAS 116 rated oil.
Carburetor Issues:
Pilot jet clogging, float bowl level inconsistencies, leading to poor idle or off-idle response.
Top End Wear:
Piston and cylinder wear due to high-performance nature and potential for aggressive riding. Regular inspection and timely rebuilds are crucial.
Cooling System Leaks:
Hose degradation, radiator leaks, and water pump seal failures can occur with age.
Clutch Slippage:
Can occur with excessive wear or improper adjustment, especially under high-load conditions.
Electrical Connector Corrosion:
Exposure to elements can lead to corrosion in electrical connectors, causing intermittent issues.
Yamaha Legacy:
Yamaha has a long history in powersports, known for innovation and performance in motorcycles and ATVs.
Initial Introduction:
Introduced in 1987, the YFZ350 Banshee quickly established itself as a dominant force in the sport ATV market due to its powerful two-stroke engine and agile handling.
Key Updates During Period:
While the core design remained consistent, updates included suspension refinements, improved braking systems, and minor cosmetic changes throughout its production run.
Production Period:
1987 - 2006 (US market, though this manual covers up to 2003 specifically)
Manufacturing Location:
Japan (assembly may have occurred in other locations depending on the market).
